Lathe dog



C. H. EASSETT LATHE DOG Filed July 20. 1921 Application filed July T all1"]?6775! '21: wmg concern: Be t kn wn that l, CILAIiLES H. a citizen oithe United States, residing at llrid oort, county of l airficld, Stateof Connecticut, have invented an improvement in llathe Dogs. of whichthe following is aspecification,

In the old. type of lathe dog employing; a set-screw for securing it tothe work, the size of the screw was necessarily linr d, the end of toescrew marred the work and forming a depression therellhis was especiallynoticeable in l. l ished work. This effect was caiu partly by t is reative turning off the end the set screw on the work when it was tigloncd. Tllcgg dogs were also liable to loos n in operation requiringcontinuous to 1 cuing They also required considerable "I in :ioplyine'and renioving from the as a wrench had to be applied to the head eachtime. and the time required in setting; up and lacing down was a veryconsidcuable part of the time rerpiired tor the job, especially inquantity production-and case-s wl'ierc a comparatively small amount of?lathe nl-z was required for each piece The old t W of was turther unsutihuttor}; under continijled use the end set screw grow larger making it.very dill cult to remove from the iolder, 3.115 the breads on the screwwore out quickly.

My invention has, tllGlQllOlfl'fOl an Oil-- set to H'OYldG a lathe dowhich will be elf-setting and releasing T, is also ob- }ect of theinvention to produce a dog which be easily and quickly adjusted for vzi-."i .25; sizes of work. It a turthcr t the invention to provide a devicepc which will mitoinatically lPCl'Bl as the resistance to v of the work.increases. A.

is to provide dog; *ith surface so that work without In; a still furtherobjec-u 51'] p on the work Ms HKA,

the invento Jrovidc a lathe dog which will be '-1 construction and will,therefore, strong and not liable to breakage, which will becomparatively cheap to manufacture and especially can be easily andquickly applied and removed from the work.

."Vith the foregoing" and other objects in View I have devised theimproved lathe dog illustrated in the accompanying drawings in which,

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Fig. l is a side elevation of my llllPlOVQll athe dog in workingposition.

l ig. is a bottom plan view of Fig. 1.

lie t'erence numeral 5 indicates a block substantially V shaped andpreferably roughened on the inner side of the legs of the t or provided,with small teeth as shown .t 6. to ticilitate gripping of'the work.

i. .Che block has a curved portion joining the o ot the preterably l-shaped in cross .0: as this gives a stronger and lighter 14: which p1uces a substantially hook.- shaped niemlc for a purpose presently to bedescribed.

The other leg of the block is provid spaceiilcars 15 bet ecn which ispivit 15 a clamping member which may 1 various structures but preferablyis "med of a piece of chain comprising' a se- -s of spaced links 16pivotally connected ;ether by means of suitable pins 17. The links arespaced a sulhcient distance transversely to receive the short arm lO'otthe lever between them and to allow the placing ot any pin 17 within therecess 1% as desired. This provid a coi'ivcnient means of ad justing'the workiin; length of the flexible clamping element depending on thesize of the work to b gripped thereby.

In operation the block 5 is placed on the work and the chain wrappedaround the other side of same and one of the pins 17 placed in therecess 14. The pin 11 is then inserted in a convenient slot of the faceplate. The face plate rotates in the direction indicated by the arrowand it will be apparent from an inspection of Fig. 1

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that the reaction of the slot 12 on the pin 11 and firmly clamp the someaboutthe work il It will be obvious that the reater the resistance tothe rotation oi the work t is greater will be the clamping effectthereon.

and releasing,- Furthermore, because of the large caring surface ontheworli, there is little dan -r oi marrinrg the surface thereoi.

s cruel: admnta 'es is the ease and ()ne of i rapidity with which thedog may be applied H to the work and the work released therefrom.

This is especially valuable in quantity production where the sameoperations are performed on large number of similar pieces. It will albe noted that, because of the simgle con uction' and comparatively fewrts inyolved, the device is conuoaratively cheap to manufacture, isstrong and rigid and not likely to get out of order.

Having thus set forth the nature of my invention, vhat I claim is:

1. A lat-he dog comprising a flbloclr adepted to ceiye worx between thelegs thereof lever tulcrumed on one'leg of the block and deal withprojection for insertion in a face plate, a flexible clamping elementattached to the other leg of the block,- and means fordetachablyconnectingisaid fie ible element to thelever whereby it may beclam )ed'about the work.

2. A lathe dog comprising V-blocl: adapted to receive work between thelegs thereof a lever tulcrunied on one ot the block and one arm thereoiprovided witn means whereby it maybe attached to a face plate, aflexible chain clamping element at tached to the other leg of the block,and the other arm of the lever being provided with a hook-shaped recessadapted for detachable connection with said chain where it may beclamped about said work.

8. A lathe dog comorising a J-block adapted to receive workbetween thelegs thereof a lever fulcrumed in one leg of the block and having meanson one thereof whereby it may be attached to a hoe plate, a flexibleclamping element connected to'the other leg of the block, and comprisinga series of transversely spaced chain links pivotally connected by aseries of pins, and the other arm of the lever adapted for insertionbetween the links and provided with a recess to receive anyone of saidpins whereby the clamping element may be clamped about l. A lathe docomprising a if-block adaptinitiates n. BASSETT.

